| Titre : |
NIR LEDs and NIR lasers as feasible alternatives |
| Type de document : |
texte imprimé |
| Auteurs : |
Christian Schmitz, Auteur ; Bernd Strehmel, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 1527-1541 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Diodes électroluminescentes
Lasers -- Applications industrielles
Photoréticulation
Revêtements -- Séchage sous rayonnement infrarouge proche
Revêtements organiques
Thermodurcissables
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Near-infrared (NIR) laser sources (800–1000 nm) can potentially reduce the processing time for curing by a fast heating and incorporation of NIR absorbers into the coating. The latter converts NIR laser light absorbed into thermal energy. This curing technique was successfully applied to one-component thermoset coatings based on blocked polyisocyanate/hydroxy-polyester and melamine formaldehyde/hydroxy-acrylate resins with heptamethine cyanines as near-infrared absorbing material. The laser curing was additionally compared with LED sources. In general, the curing time significantly decreases in comparison with traditional heat sources. Furthermore, the photopolymerization of acrylates or epoxides can be induced simultaneously by adding suitable initiators due to photochemical generation of radicals and cations. Curing of the thermoset resin system and the photopolymerization process created interpenetrating networks. Principally, the techniques reported based on photonic NIR sources may help to substitute oven techniques where thermal activation of curing reactions is typically induced by oven or heating with infrared radiators for coating applications. |
| Note de contenu : |
- Materials and preparation of coatings
- LED exposure
- Laser exposure
- Bleaching
- Mechanical properties
- Gel content
- Heating curve
- LED light-induced thermal curing
- Laser light-induced thermal curing
- Laser with line focus for curing
- Interpenetrating networks by baking of coatings and polymers
- Bleaching of the absorbers |
| DOI : |
10.1007/s11998-019-00197-3 |
| En ligne : |
https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00197-3.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33257 |
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1527-1541
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NIR LEDs and NIR lasers as feasible alternatives in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
